Hello, maintainers. I found that the first problem (slow response) is resolved, if fcitx was upgraded to 1:4.2.9.4-3.
In conclusion, this problem was not a matter of mate-panel but a problem on fcitx side. I guess fcitx did not support some kind of new feature of mate-panel 1.18.4-2. The second problem (missing mozc icon) still exists, however, it may be a problem of fcitx-mozc side too. How can I check? -- Takashi Yano <takashi.y...@nifty.ne.jp>